I have had 2 AMD x2 550's, and a x2 555 all of which unlocked to X4 quad's and were stable OC'd some. What does AMD benefit from allowing the unlocking, but also what if anything is wrong with the processor for AMD to label it an X2. I usually run intensive games, benchmarks, and some prime to ensure stability... but I can't help think something must be wrong with it for AMD to have bin it as X2.
it allows AMD to sell bad batches of quad core chips as dual core/triple core chips that would otherwise get tossed out. To keep up with demand, they slip in good chips. Some people get good chips, some don't.
Lots of businesses do that: three for the price of two, etc - it makes you buy more. But with the Thuban they messed up. For buying six cores they should have thrown in the package at least two free extra cores.
I'm guessing AMD probably stress tests the CPU's more then the average user would ever do... is it possible they get binned because they fail during a crazy nasa type stress test situation that I as the average user would never replicate, but that now makes the X4 an X2?